Not to downplay the idea that pi's fs in unreliable, but there's another player here which is the SD card. Many SD cards are way less reliable than the imaginar

Not to downplay the idea that pi's fs in unreliable, but there's another player here which is the SD card. Many SD cards are way less reliable than the imaginary R/W spec given by manufacturers, and there's a crazy amount of grey matter and counterfeiting.